Fans of Netflix's original series Stranger Things have noticed something peculiar (besides the on-screen characters' frequent visits to the Upside Down) about the show. Dustin Henderson — one of the quirky nerds from the series' main friend group, which is also made up by Eleven, Lucas Sinclair, Mike Wheeler, and Will Byers — is played by Gaten Matarazzo, whose last name has been causing some major confusion among ST fans.

Tons of viewers have been questioning it and are itching to know: is Gaten Matarazzo related to Heather Matarazzo, the actress who played Lilly alongside Anne Hathaway in Princess Diaries? After all, they have the same last name

According to 35-year-old Heather — who appeared on several episodes of Grey's Anatomy back in 2015 — she is not in any way, shape, or form related to Gaten. She made this fact clear on Twitter.

"We are not related. He is NOT my son, though he is adorable and such a good actor," she tweeted back in 2016. According to Heather's Wikipedia page, she is not married, nor does she have any children.

Despite the actress' clear declaration that she is not related to the Stranger Things star, there is still a lot of uncertainty among fans. That's partly because not only do these actors have the same last name, but Gaten's mother's first name is actually Heather, also. So his mom is Heather Matarazzo, but not the Princess Diaries' Heathe Matarazzo.

In fact, Gaten's mom is a bit of a star in her own right. Not only is Heather responsible for supporting her son's decision to go into acting — she even drove him into the city from their hometown in New Jersey every night when he landed a role in a Broadway show — but she's also a familiar face! After all, the actor brought his mama as his date to this year's Golden Globes Awards.

Gaten's mom, Heather Matarazzo, describes herself on her Twitter account as, "a broadway stage mom, a soccer/basketball mom, and the mom of a just-about-to-drive teenager! They are my joy," she adds. She was also interviewed in 2012 for NJ.com when Gaten played Benji in Priscilla Queen of the Desert, the Musical.

So there you have it, folks! The mystery of Gaten Matarazzo's lineage and the two Heather Matarazzos solved — one's an actor and the other is the mom of an actor. Case and point!